Possible ways o making interstate markers distinctive are legend, shape, color, size and position; legend is most important means; interstate highways should be identified by letters or by adding "I" (Interstate) prefix to existing numbers.
Identify interstate highways with letters?
Better Roads
Better Roads ; 27 , n 3
1957
Aufsatz (Zeitschrift)
Englisch
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Marking Interstate System of highways
Engineering Index Backfile | 1956
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Engineering Index Backfile | 1944
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Engineering Index Backfile | 1946
Design standards for national system of interstate highways
Engineering Index Backfile | 1945